Mask



FIG. 1 is a front perspective view of a mask showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view, the right side elevational viewbeing a mirror image thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a detailed view of portion “8” in FIG. 4 .

The broken lines shown in the drawings demarcate the enlarged view seenin FIG. 8 and form no part of the claimed design.

CLAIM The ornamental design for a mask, as shown and described.